This criterion is for smaller-scale lighting applications such as indoor lighting. Similarly, for a 150W bulb, an LED with 3000 Lumens is your best option. If you want an equivalent of a 40W incandescent bulb, look for the LED bulb with 600 lumens output. Wattage has no significance while looking for the bulbs as the latest technologies use much fewer watts than old lighting bulbs. If you want to replace old incandescent and halogen bulbs, match the lumens with the new bulbs on the market. Look for lumens instead of wattsįind out the total lumens that are needed to illuminate your project thoroughly. This section consists of essential steps and tricks to help you buy the right kind of bulb that gives off your project’s required brightness.
Lumen to watt how to#
Light typeĬomparison of luminous efficacy for different lighting technologies How To Choose The Best Light Bulb? Making a switch to all LED lights can easily cut ~50% of your energy usage and, thus, the electricity bill. LEDs have taken the top spot with the efficiency of 80-100 Lm/W and rightly so. The table below indicates the difference in the efficacies of various technologies. Always check the label of the bulb to have a better idea regarding the efficacy. You should note that luminous efficacy varies from manufacturer to manufacturer. Watts are no longer helpful in determining the brightness, but they are helpful in measuring the bulb’s luminous efficacy.
This is a massive jump in the energy-saving aspect of lights. Nowadays, you can find LEDs offering 140 lumens per watt. For example, the incandescent bulbs had the efficacy of only 15 lumens per watt. The older technology had a very low luminous efficacy. This term refers to the efficiency by which a bulb converts watts to lumens. Luminous efficacy is lumens divided by watts. watt for different lighting technologies What is Luminous Efficacy? There is a drastic difference between incandescent and LEDs’ energy usage under the same lumen output range. The table below shows a lumen to watt comparison for LEDs, Halogens, CFLs, and incandescent. If you are looking to switch to more energy-efficient options such as LEDs and CFLs, you will need to find the same lumens as your old incandescent bulbs in the new LED/CFL bulbs. Watts= Lumen/Lumen per watt Comparison of different bulb technologies The easy formula to calculate watts out of the lumens mentioned on the bulb label is. Sometimes you will be required to find the wattage corresponding to the required lumens of a particular lighting fixture, and this is where you need to convert lumens to watts. While choosing a bulb for your project, you will need to select the correct number of lumens for the area. This drastic difference has changed the course of energy-saving debates. In contrast, an LED produces 100 lumens per watt. An easy example to understand the whopping difference between different lighting technologies’ energy-saving aspects is that an incandescent bulb produces about 20 lumens per watt. Lumens is now the prevalent measurement unit to judge the brightness of a light bulb. It is more accurate a measuring unit than wattage and tells how the lighting fixture performs regardless of the electricity source. A higher number of lumens will mean a higher brightness level and vice versa. Lumens are the measurement of output light brightness of lighting bulbs.
So, the term ‘lumens’ came into being, and wattage ratings became unpopular. Such lamps gave off a high level of brightness output at a fraction of wattage. Their working principle is different from older lamps. So wattage became a measure of brightness.Īs the technology improved, these lighting bulbs were taken over by much more efficient and energy-saving lighting fixtures such as LEDs and energy-saving CFLs.
Higher the watts, the higher the brightness level of the output light. The higher wattage meant higher brightness for lamps such as incandescent, fluorescent, etc.įor example, in incandescent lamps, the electricity passes throughout the filament inside the bulb to produce heat and brightness. In olden times, people bought lights by looking at the wattage of the bulb. Watt is the unit of power that measures the energy usage of the lighting fixture. However, this practice has become obsolete as new energy-efficient bulbs entered the market that gives off the same number of lumens (or the brightness level) at a lower wattage. It was common practice to look for the ‘Watts’ before buying a lighting bulb in the past.
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